From: Bjorn Helgaas Date: Tue, 31 Jan 2017 22:35:42 +0000 (-0600) Subject: PCI: rcar: Use of_device_get_match_data() to simplify probe X-Git-Tag: v4.11-rc1~92^2~8^2 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=ff1677e231651205e7e19770a677057dea05cb70;p=linux.git PCI: rcar: Use of_device_get_match_data() to simplify probe This is a DT-only driver, so the only way to call rcar_pcie_probe() is to match an entry in rcar_pcie_of_match[], so of_id cannot be NULL. Furthermore, of_id->data can only be NULL if an rcar_pcie_of_match[] entry has a NULL .data member. That's a driver defect, and we don't want to return -EINVAL, which is easy to ignore. We'd rather take the NULL pointer dereference so we notice the problem and fix it. Use of_device_get_match_data() to retrieve the hw_init_fn pointer. No functional change intended. Suggested-by: Geert Uytterhoeven Signed-off-by: Bjorn Helgaas Reviewed-by: Geert Uytterhoeven Acked-by: Simon Horman --- diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c index 0d9b96c3c49d..cb07c45c1858 100644 --- a/drivers/pci/host/pcie-rcar.c +++ b/drivers/pci/host/pcie-rcar.c @@ -1125,7 +1125,6 @@ static int rcar_pcie_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct rcar_pcie *pcie; unsigned int data; - const struct of_device_id *of_id; int err; int (*hw_init_fn)(struct rcar_pcie *); @@ -1149,11 +1148,6 @@ static int rcar_pcie_probe(struct platform_device *pdev) if (err) return err; - of_id = of_match_device(rcar_pcie_of_match, dev); - if (!of_id || !of_id->data) - return -EINVAL; - hw_init_fn = of_id->data; - pm_runtime_enable(dev); err = pm_runtime_get_sync(dev); if (err < 0) { @@ -1162,6 +1156,7 @@ static int rcar_pcie_probe(struct platform_device *pdev) } /* Failure to get a link might just be that no cards are inserted */ + hw_init_fn = of_device_get_match_data(dev); err = hw_init_fn(pcie); if (err) { dev_info(dev, "PCIe link down\n");